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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f930b88f6cd3f8e888fc7180a2cac8abda5944bf58cc7176a28accdd1ef7a64f' 
  AND token = '+uniG912j4e8Gi6JOF4EKSCrDCx/tuDiAHotT8DcvBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}